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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_010_398">&nbsp;</a>NAME</h4><blockquote>
vfprintf, vprintf, vsnprintf, vsprintf - format output of a
stdarg argument list
</blockquote><h4><a name = "tag_000_010_399">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="stdarg.h.html">stdarg.h</a>&gt;
#include &lt;<a href="stdio.h.html">stdio.h</a>&gt;

int vfprintf(FILE *<i>stream</i>, const char *<i>format</i>, va_list <i>ap</i>);
int vprintf(const char *<i>format</i>, va_list <i>ap</i>);
int vsnprintf(char *<i>s</i>, size_t <i>n</i>, const char *<i>format</i>, va_list <i>ap</i>);
int vsprintf(char *<i>s</i>, const char *<i>format</i>, va_list <i>ap</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_010_400">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>vprintf()</i>,
<i>vfprintf()</i>,
<i>vsnprintf()</i>
and
<i><a href="vsprintf.html">vsprintf()</a></i>
functions are the same as
<i><a href="printf.html">printf()</a></i>,
<i><a href="fprintf.html">fprintf()</a></i>,
<i><a href="snprintf.html">snprintf()</a></i>
and
<i><a href="sprintf.html">sprintf()</a></i>
respectively,
except that instead of being called with a variable number of
arguments, they are called with an argument list as defined by
<i><a href="stdarg.h.html">&lt;stdarg.h&gt;</a></i>.
<p>
These functions do not invoke the
<i>va_end</i>
macro.
As these functions invoke the
<i>va_arg</i>
macro, the value of
<i>ap</i>
after the return is indeterminate.
</blockquote><h4><a name = "tag_000_010_401">&nbsp;</a>RETURN VALUE</h4><blockquote>
Refer to
<i><a href="printf.html">printf()</a></i>.
</blockquote><h4><a name = "tag_000_010_402">&nbsp;</a>ERRORS</h4><blockquote>
Refer to
<i><a href="printf.html">printf()</a></i>.
</blockquote><h4><a name = "tag_000_010_403">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_010_404">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
Applications using these functions should call
<i>va_end</i>(<i>ap</i>)
afterwards to clean up.
</blockquote><h4><a name = "tag_000_010_405">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_010_406">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="printf.html">printf()</a></i>,
<i><a href="stdarg.h.html">&lt;stdarg.h&gt;</a></i>,
<i><a href="stdio.h.html">&lt;stdio.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from Issue 1 of the SVID.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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